How about this for a game twist for a later round? Have one of the players be the Gnats. A non-assassin son (AC maybe) could post "Gnats" at some point during the action. The Gnats couldn't kill anyone (as they are already dead, soulless cnuts) or block anyone, but the first living assassin posting after the Gnats would get the joy of gouging out their eyeballs and pissing on their dead carcass. But that would also draw them out from cover, making it a risky move for anyone hoping to win